SliTaz Repositories

     1.1 --- a/BootProg/stuff/boot32.asm	Wed Apr 20 16:57:09 2022 +0000
     1.2 +++ b/BootProg/stuff/boot32.asm	Fri Apr 22 16:00:56 2022 +0000
     1.3 @@ -59,12 +59,12 @@
     1.4  ;;                                                                          ;;
     1.5  ;;                   Boot Image Startup (register values):                  ;;
     1.6  ;;                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                  ;;
     1.7 -;;  dl = BIOS boot drive number (e.g. 80H)                                  ;;
     1.8 +;;  ax = 0ffffh (both FCB in the PSP don't have a valid drive identifier),  ;;
     1.9 +;;  bx = cx = 0, dl = BIOS boot drive number (e.g. 0, 80H)                  ;;
    1.10  ;;  cs:ip = program entry point                                             ;;
    1.11  ;;  ss:sp = program stack (don't confuse with boot sector's stack)          ;;
    1.12  ;;  COM program defaults: cs = ds = es = ss = 50h, sp = 0, ip = 100h        ;;
    1.13  ;;  EXE program defaults: ds = es = EXE data - 10h (fake MS-DOS psp),       ;;
    1.14 -;;  ax = 0ffffh (both FCB in the PSP don't have a valid drive identifier),  ;;
    1.15  ;;  cs:ip and ss:sp depends on EXE header                                   ;;
    1.16  ;;  Magic numbers:                                                          ;;
    1.17  ;;    si = 16381 (prime number 2**14-3)                                     ;;
    1.18 @@ -73,6 +73,7 @@
    1.19  ;;  The magic numbers let the program know whether it has been loaded by    ;;
    1.20  ;;  this boot sector or by MS-DOS, which may be handy for universal, bare-  ;;
    1.21  ;;  metal and MS-DOS programs.                                              ;;
    1.22 +;;  The command line contains no arguments.                                 ;;
    1.23  ;;                                                                          ;;
    1.24  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    1.25  
    1.26 @@ -303,8 +304,10 @@
    1.27          dec     word [bx+06h]           ; reloc items, 32768 max (128KB table)
    1.28          jns     ReloCycle
    1.29  
    1.30 -        add     [bx+0Eh], bp
    1.31 -        lss     sp, [bx+0Eh]            ; ss:sp for EXE
    1.32 +        les     si, [bx+0Eh]
    1.33 +        add     si, bp
    1.34 +        mov     ss, si                  ; ss for EXE
    1.35 +        mov     sp, es                  ; sp for EXE
    1.36  
    1.37          lea     si, [bp-10h]            ; ds and es both point to the segment
    1.38          push    si                      ; containing the PSP structure
    1.39 @@ -336,7 +339,7 @@
    1.40  ReadCluster:
    1.41          mov     bp, [bx(bpbBytesPerSector)]
    1.42          shr     bp, 4                           ; bp = paragraphs per sector
    1.43 -        add     eax, byte 1             ; adjust LBA for next sector
    1.44 +        add     eax, byte 1                     ; adjust LBA for next sector
    1.45          inc     cx
    1.46          loop    ReadSectorLBA
    1.47  
    1.48 @@ -349,7 +352,7 @@
    1.49  ;;         BP -> para / sector  ;;
    1.50  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    1.51  
    1.52 -        imul    ax, bp, byte 2                  ; ax=# of FAT32 entries per sector
    1.53 +        imul    ax, bp, byte 4                  ; ax=# of FAT32 entries per sector
    1.54          cwde
    1.55          lea     edi, [esi-2]                    ; esi=cluster #
    1.56          xchg    eax, esi
    1.57 @@ -369,7 +372,7 @@
    1.58  
    1.59          xchg    eax, edi
    1.60          movzx   ecx, byte [bx(bpbSectorsPerCluster)]
    1.61 -        mul     ecx				; edx:eax=sector number in data area
    1.62 +        mul     ecx                             ; edx:eax=sector number in data area
    1.63  
    1.64          add     eax, edi
    1.65          adc     word [bx(HiLBA)], dx
    1.66 @@ -408,7 +411,7 @@
    1.67          int     13h                     ; extended read sectors (DL, DS:SI)
    1.68          jnc     ReadSuccess             ; CF = 0 if no error
    1.69  
    1.70 -        cbw                             ; ah = 0 = reset function
    1.71 +        xor     ax, ax                  ; ah = 0 = reset function
    1.72          int     13h                     ; reset drive (DL)
    1.73  
    1.74          dec     bp